How does one upload a AWS 'Account Private Key File' and 'Account Certificate File' to the Bamboo OnDemand server?

I need to use an EBS snapshot to hold a Maven artifact repository but am having trouble trying to configure the AWS key/certificate files for the Bamboo OnDemand server. I know in the Elastic Bamboo Configuration -> AWS Settings there is an option to upload from the PC. Is that where I upload these files? Or do I need to ssh in a machine and do some work?